/*=========================================================================
 *
 *  Copyright Insight Software Consortium
 *
 *  Licensed under the Apache License, Version 2.0 (the "License");
 *  you may not use this file except in compliance with the License.
 *  You may obtain a copy of the License at
 *
 *         http://www.apache.org/licenses/LICENSE-2.0.txt
 *
 *  Unless required by applicable law or agreed to in writing, software
 *  distributed under the License is distributed on an "AS IS" BASIS,
 *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 *  See the License for the specific language governing permissions and
 *  limitations under the License.
 *
 *=========================================================================*/

#ifndef __makeRandomImageBsplineInterpolator_h
#define __makeRandomImageBsplineInterpolator_h

#include "itkBSplineResampleImageFunction.h"
#include "itkRandomImageSource.h"
template<typename BSplineInterpolatorFunctionType>
typename BSplineInterpolatorFunctionType::Pointer makeRandomImageInterpolator(const int SplineOrder)
{
  using ImageType = typename BSplineInterpolatorFunctionType::InputImageType;

  /** Generate a random input image and connect to BSpline decomposition filter */

  using SourceType = itk::RandomImageSource<ImageType>;
  typename SourceType::Pointer source = SourceType::New();
    {
    using DirectionType = typename ImageType::DirectionType;
    DirectionType  nonTrivialDirection;

    nonTrivialDirection[0][0] = 0;
    nonTrivialDirection[0][1] = -1;
    nonTrivialDirection[1][0] = 1;
    nonTrivialDirection[1][1] = 0;
    std::cout << "DIRECTION\n" << nonTrivialDirection << std::endl;
    source->SetDirection( nonTrivialDirection );
    }
    {
    using SpacingType = typename ImageType::SpacingType;
    SpacingType    spacing;
    spacing.Fill( 2.0 );
    source->SetSpacing( spacing );
    }
    {
    using PointType = typename ImageType::PointType;
    PointType      origin;
    origin.Fill ( 10.0 );
    source->SetOrigin( origin );
    }
    {
    using SizeType = typename ImageType::SizeType;
    SizeType       size;
    size.Fill( 32 );
    source->SetSize( size );
    }

  source->SetMin( 0.0 );
  source->SetMax( 10.0 );
  source->Update();
  typename ImageType::Pointer randImage = source->GetOutput();

  /** Set up a BSplineInterpolateImageFunction for comparison. */

  typename BSplineInterpolatorFunctionType::Pointer interpolator = BSplineInterpolatorFunctionType::New();

  interpolator->SetSplineOrder( SplineOrder );
  interpolator->SetInputImage( randImage );
  return interpolator;
}

#endif
